Metallogenie des indices de cuivre-fer (+/- or) du gite du Mont-de-l'Aigle, Gaspesie.

摘要

The Mont-de-l'Aigle deposit is located in the northern part of Dome Lemieux, a subcircular antiform structure of Siluro-Devonian sedimentary rocks cut by mafic and felsic sills and dikes of Silurian to Late Devonian age. The iron oxide-copper mineralization of Mont-del'Aigle occurs in veins, stockwerk, and breccias filled by hematite, quartz, pyrite, dolomite, magnetite and chalcopyrite. Mineralization is located near or within N-S and NW-SE faults cutting sedimentary rocks. The paragenetic sequence comprises: (1) pervasive sodic, potassic, chlorite and silica alteration, (2) hematite, quartz, pyrite and chalcopyrite filled veins, stockwerks and breccias and (3) dolomite +/- hematite veins and veinlets cutting the earlier paragenesis. Abundance of hematite, occurrence of large breccias bodies with hematite-quartz cement, alteration and isotope composition indicate that the Mont-del'Aigle deposit has similarities with iron oxide-copper-gold deposits (IOCG). The Mont-del'Aigle deposit is a rare example of Paleozoic, shallow level, iron-oxide-copper-gold deposit.